JavaScript Beautifier

The JavaScript Beautifier formats minified, compressed, or poorly indented JavaScript code into clean, readable source code. Whether you're debugging a third-party script, reviewing a bundled JS file from a production build, or trying to understand obfuscated code, this tool gives you a properly indented, human-readable version in seconds.

Modern JavaScript ecosystems use bundlers like Webpack, Rollup, and esbuild that combine and minify multiple JS files into a single, unreadable bundle. When an error occurs, tracing it back to the original source is much easier with formatted code. Our beautifier supports all modern JavaScript syntax including ES2023, arrow functions, async/await, destructuring, template literals, and optional chaining.

Key Features

• ES6+ support — handles arrow functions, async/await, classes, modules, destructuring, and all modern syntax.
• Configurable indentation — choose 2 spaces, 4 spaces, or tabs.
• Brace style options — collapse or expand brace placement to match your team's style guide.
• Preserves comments — inline and block comments are retained in the output.
• Handles large files — formats large JS bundles and libraries efficiently.
• Syntax highlighting — color-coded output makes reading complex code easier.

How to Beautify JavaScript

1. Paste your minified or unformatted JavaScript into the code editor.
2. Select your preferred indentation size and brace style.
3. Click Beautify JS.
4. The formatted, readable JavaScript appears in the output panel.
5. Click Copy or Download to save the result.

Practical Use Cases

Debugging production scripts: When a client reports an error on a live site, production JS is minified. Format it here to read the logic and trace the bug. Security auditing: Before running a third-party script on your site, format and review its source to ensure nothing malicious is present. Learning from examples: Find an interesting script on a website? Beautify it to understand how it's written. Code recovery: If the original source was lost but the minified version remains, beautifying gives you a workable starting point.